''another skype instance may exist''

You want to login to skype but you cant because you receive the following error:
"'another skype instance may exist'"
This seems to be a common problem with skype and ubuntu.

Solution:

1] Open the terminal
2] cd into the folder /home/users/username/.Skype by typing the command
#cd /home/users/username/.Skype
#ls

You may see 3 files : shared.lck, shared.xml and skype_account

3] Move the folder skype_account to skype_account1
#mv skype_account skype_account1

4] Revert it back
#cp -arv  skype_account1 skype_account

Restart the skype and login!!!!

Does this work?
Leave me a comment.